For insulated pipes or cryogenic containers, when the insulation layer is damaged and loses its function, how can it be restored to meet the requirements?

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In daily equipment management, we develop major repair and renewal plans for the equipment under our oversight every year. Often, we, as corrosion and protection professionals, develop maintenance plans for insulated pipes or equipment that require major repairs or updates. So how can we do this job well? This requires the technical skills we have accumulated over time to come in handy. For example, take a look at the following question: what approach meets the requirements? In some cryogenic pipelines or low-temperature containers, the medium is liquid ammonia at a temperature of -20°C; local corrosion of the metal surfaces occurs, and the insulation layer is damaged, losing its function. It’s mainly about restoring it – what needs to be done to meet the requirements? Here, it is required to ignore the existing insulation structure layer. Based on your technical knowledge, see how you can come up with a reasonable solution.